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Jetting Crf250r

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2007 Honda CRF250R Comparison
…performed almost flawlessly. If Honda could clean up the 40mm carb to eliminate the bog we'd be completely out of things to complain about. Honda CRF250R The list of tweaks for 2007 is relatively small. Changes were limited primarily to a revalving of the 47mm Showa fork, and a new front brake master…
2006 CRF250R Project Bike
…tested four of the '06 crop of 250 4-strokes during our recent 250F MX Shootout , we were particularly thrilled to get our grubby mitts on the new CRF250R with its distinctive twin pipe exhaust. The CRF didn't disappoint us once we took it out onto the track and garnered rave reviews from our test riders…
2008 Honda Off-Road First Look
…changes may add up to a much different feel in the rider layout. The CRF150F had the same modifications performed on it as well, but also gets new jetting for the 24mm carb. The smaller F models, including the 100F, 80F, 70F and 50F are carryover models for the 2008 season. While Honda's smallest off…
2013 Honda CRF450R First Look
…set-up used on the ’04-’08 CRF250R returns. The clutch was also reworked and now offers a six-spring design (previous was four) that will provide more consistent engagement throughout the duration of a moto. Other durability enhancements include an added oil jet (to cool the bottom of the piston…
2006 CRF250R Project Bike Part II
…technology, but we know that isn't a realistic scenario for most people. For this reason we threw a few aftermarket accessories onto our trusty 2006 CRF250R. We figured that people are going to be modifying their machines anyway, so we took ours in the direction of an off-road utilitarian with the goal…
2011 Yamaha YZ250F Long Term Test 1
…(Below) Test rider Chris See wheelies past the white flag during a race at Glen Helen with REM. YZ250F Jetting Specs: Main: 180 Pilot: 45 Needle: NDJR Clip Position: 4 Fuel Screw: 3/4 turns Leak Jet: 70 Opposed to other manufacturer’s fuel-injected 250Fs, the YZ-F still employs a conventional mechanically…
2010 Yamaha YZ250F First Ride
…the lower shock spring). Faster, smoother air intake and a new venturi-shaped Keihin FCR MX37 carburetor call for more fuel, so the jetting has been richened. The main jet jumped from 178 to 180, pilot from 42 to 45, with a richer needle and an extra quarter-turn on the fuel screw. Valve spring retainers…
2009 Rocket Exhaust Honda CRF250R
…just the cylinder head you get the performance you need without sacrificing reliability."" In stock form, most CRF250R riders will tell you it's tough to achieve perfect carburetor jetting. At some point that With the exception of the Hinson clutch internals all the engine hard parts are stock in order…
2009 Honda CRF250R First Ride
…motor."" This year's CRF250R comes in at a claimed 227 lbs. fully-fueled and ready to ride. MotoUSA's test rider Matt Armstrong demomstrates how easy it is to get it sideways. However, the Achilles heel of this almost-perfect power package was a persistent bottom-end jetting issue. Although fueling…
2010 Honda CRF250R Comparison
…as pros, and the EFI is phenomenal!"" Testers love the option of tuning the fuel injection with a calibration tool rather than swapping carburetor jets. The PGM-FI also negates the need for a hot-start lever which makes the starting process easier. Aiding the bike's power output is a well-designed five…
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